package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.minio.MinioProperties;
import com.atguigu.lease.web.admin.service.FileService;
import io.minio.*;
import io.minio.errors.*;
import io.minio.messages.CreateBucketConfiguration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

@Service
public class FileServiceImpl implements FileService {

    @Autowired
    private MinioClient minioClient;

    @Autowired
    private MinioProperties properties;
    @Override
    //在这里抛出异常,在controller层捕获异常
    public String upload(MultipartFile file) throws ServerException, InsufficientDataException, ErrorResponseException, IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidResponseException, XmlParserException, InternalException {
        //判断桶是否存在
            boolean exists = minioClient.
                            bucketExists(BucketExistsArgs.builder()
                                    .bucket(properties.getBucketName())
                                    .build());
            //如果不存在创建桶
            if (!exists) {
                minioClient.
                        makeBucket(MakeBucketArgs.builder()
                                .bucket(properties.getBucketName())
                                .build());
                //设置桶权限
                minioClient.setBucketPolicy(SetBucketPolicyArgs.builder()
                        .bucket(properties.getBucketName())
                        .config(createBucketPolicyConfig(properties.getBucketName()))
                        .build());
            }
            //设置文件名称命名规则
            String fileName = new SimpleDateFormat("yyyyMMdd")
                    .format(new Date()) + "/" + UUID.randomUUID() + "-" + file.getOriginalFilename();
            //上传文件到minio
            minioClient.putObject(PutObjectArgs.builder()
                    .bucket(properties.getBucketName())
                    .object(fileName)
                    .stream(file.getInputStream(), file.getSize(), -1)
                    .contentType(file.getContentType())
                    .build());
            return String.join("/", properties.getEndpoint(), properties.getBucketName(), fileName);

    }


    //定义权限规则方法
    private String createBucketPolicyConfig(String bucketName) {

        return """
            {
              "Statement" : [ {
                "Action" : "s3:GetObject",
                "Effect" : "Allow",
                "Principal" : "*",
                "Resource" : "arn:aws:s3:::%s/*"
              } ],
              "Version" : "2012-10-17"
            }
            """.formatted(bucketName);
    }
}
